Lipoma consists of well-differentiated adipose tissue. Body surface lipoma mainly originates from subcutaneous adipose tissue, mostly seen in the back, buttocks and limbs, and is a benign tumor. The performance is as follows: 1, the mass grows slowly, generally asymptomatic, occasional tingling sensation when squeezing (painful lipoma). 2.Surface skin of the lump is normal, the tumor is soft and lobulated on palpation, the boundary is clear, and most of them have good activities. b ultrasound is good for the diagnosis of lipoma, and the accuracy is high. Treatment: (1) Smaller (within 1cm in diameter), multiple lipomas, generally do not need treatment. (2) For larger ones, surgical resection is recommended. (3) Painful lipoma should be excised. (4) Surgery is appropriate for those with recent rapid growth. (5) Drug treatment is ineffective.